Plant Answers

Weed Control Programs for Spring and Summer:

Summer weeds or Winter weeds can get out of control without proper management.

By April, spring application of preemergent herbicides for the control of summer annual weeds should have been applied. However, if they have not been applied, application of a preemergent herbicide at this time will still control a majority of the summer annual weeds. Application of preemergent herbicides should be used on St. Augustinegrass and centipedegrass lawns with caution in the spring. While these herbicides are selective for turfgrasses, they can cause root pruning in these particular grasses, especially if they are under stress. Also, bermudagrass and/or zoysiagrass areas that were not watered during the winter months should be treated with caution.

The summer grassy and broadleaf weeds are just starting to appear in turfgrass sites. For the broadleaf weeds, use one of the two-way or three-way hormone herbicide combination products. For grassy weeds, use one of the herbicides containing MSMA or DSMA. Note, for the arsenical herbicides to work, daytime temperatures need to be in the upper 80 to lower 90 degree F. range. For hard to control grassy weeds such as dallisgrass, it will probably take 2 to 3 applications applied at a 7 to 10 day interval. It is very important to not water or mow the turfgrass for at least 24 and preferably 48 hours after treating with one of the arsenical herbicides. Note, remember that the arsenical products such as MSMA and DSMA cannot be used on St. Augustinegrass or Centipedegrass lawns.

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Listed below are several herbicide lists. While these are partial lists, they do contain some of the more common herbicides used for weed control in turfgrass areas. It is the buyer’s responsibility to read the herbicide label carefully before purchasing the product to make certain it is 1) still labeled for use on the weed they are trying to control and 2) and for the site ( residential lawn vs. sports field vs. sod farm, etc.) and 3) the particular turfgrass species and variety they are treating. Always read the label carefully before applying the herbicide to make sure the correct rate is being applied for effective weed control.

These lists are were formulated in April, 2006, as a resource list for herbicide recommendations. These will change from year to year.

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Table 1. Partial List of Common and Trade Names for Preemergent Herbicides Used to Control Annual Weeds in Turfgrasses:

Common name Trade name(s)

atrazine Atrazine 4L, Aatrex 4L, Purge 4L

benefin Balan 2.5 G, Balan 60 DF, 2.5 Benefin Granules

benefin + oryzalin XL 2G, Excel-5 Plus

benefin + oxadiazon Regal Star

benifin + trifluralin Team 2G, Team Pro

bensulide Betasan, Bensumec, PreSan, Weedgrass Preventor

bensulide + oxadiazon Goose/Crab Control

dithiopyr Dimension, Ultra WSP

ethofumesate Prograss 1.5 EC

isoxaben Gallery

metolachlor Pennant Magnum 7.62 EC

oryzalin Surflan 4 AS

oxadiazon Ronstar¹

pendimethalin Pendulum (several), Pre-M

prodiamine Barricade, Endurance, Factor, RegalKade G

pronamide Kerb

simazine Princep 4L, Simazine 4L, Simtrol 4L

1. not for use in residential lawns.

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Table II. Partial List of Common and Trade Names for Postemergent Control of Broadleaf Weeds in Turfgrass:

Common name Trade name(s)

atrazine Atrazine, Aatrex 4L, Purge 4L

carfentrazone Quicksilver

chlorosulfuron Corsair

clopyralid Lontrel¹

diquat Reward Landscape & Aquatic Herbicide

ethofumesate Prograss 1.5 EC

flazasulfuron Katana

fluroxpyr Spotlight

foramsulfuron Revolver

imazaquin Image

MCPA MCPA L.V. 4 Ester

MCPA, MCPP, dicamba TriPower Selective, Encore,

MCPA, MCPP, dicamba, carfentrazone Powerzone

MCPA, triclopyr, dicamba TruPower

MCPA, fluroxypyr, dicamba TruPower 2

Mecroprop (MCPP) MCPP-4 amine,

Mecomec 2.5 EC

MCPP, 2,4-D, dicamba Trimec Southern, Lesco Three Way Selective,

Bentgrass Selective, Triplet SF

MCPA, triclopyr, dicamba Cool Power Ester, Lesco Eliminate, Three Way

Ester II Sensitive, Horsepower

metsulfuron-methyl Blade, Manor

quinclorac Drive

triclopyr Turflon Ester

triclopyr, clopyralid Confront¹

2,4-D Dymec, WEEDestroy AM-40 Amine,

Hardball, Lesco A- 4D

2,4-D, 2,4-DP Patron 170 Ester

2,4-D, clopyralid, dicamba Millennium Ultra

2,4-D, clopyralid, dicamba, MSMA Millennium Ultra Plus

2,4-D, dicamba Lesco Eight-One

2,4-D, MCPP, dicamba Three-Way Selective, Trimec Southern,

Trimec Bentgrass, Trimec Classic,

Trimec Turf Herbicide

2,4-D, MCPP-p, dicamba Triplet HI-D, Triplet Selective

2,4-D, MCPP,dicamba, carfentrazone Speedzone, Speedzone Southern

2,4-D, MCPP, dicamba, sulfentrazone Surge

2,4-D, MCPP, 2,4-DP Dissolve, Triamine

2,4-D, triclopyr, clopyralid Momentum

2,4-D, triclopyr Chaser

MSMA, 2,4-D, MCPP, dicamba Trimec Plus

trifloxysulfuron Monument

1. not for use in residential lawns.

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Table III. Partial List of Common and Trade Names for Control of Grassy Weeds in Turfgrasses:

Common name Trade name(s)

chlorsulfuron Corsair

diquat Reward Landscape & Aquatic Herbicide

ethofumsate Prograss 1.5 EC

fenoxaprop Acclaim¹

flazasulfuron Katana

foramsulfuron Revolver³

fluazifop-p-butyl Fusilade II²

metribuzin Sencor 75W

metsulfuron-methyl Blade, Manor

MSMA MSMA 6 Plus, Bueno 6, Target 6.6, MSMA

Plus HC, TurfMax 6 Plus, MSMA Turf

Herbicide, Lesco Soluble MSMA Granules

MSMA, 2,4-D, MCPP, dicamba Trimec Plus

rimsulfuron TranXit³

trifloxysulfuron Monument³

for grassy weed control in cool season turfgrasses.

for control of grassy weeds in zoysiagrasses.

primarily used for poa annua control and as ryegrass transition aid.

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Table IV. Partial List of Herbicides for the Control of Sedges in Turfgrasses:

Common name Trade name(s)

halosulfuron Sedgehammer

imazaquin Image

sulfosulfuron Certainty

trifloxysulfuron Monument

sulfentazone Dismiss

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Table V. Partial List of Common and Trade Names for Preemergent Weed Control in Home Lawns by Homeowners:

Common Name Trade Names (partial list)

1. dithiopyr Sta-Green Crab Ex; Green Light Crabgrass Preventor;

Vigoro Preemergent Crabgrass and Weed Preventor

2. pendimethalin Scotts Halts Crabgrass Preventor

3. oryzalin Southern Ag. Surflan A.S.

4. isoxaben Portrait Broadleaf Weed Preventor

5. benefin + oryzalin Green Light Amaze Grass and Weed Preventor; XL 2G;

6. benefin + trifluralin Hi-Yield Crabgrass Preventor; Southern Ag. Team 2 G

7. corn gluten meal Concern All Natural Weed Preventor Plus

Nature’s Guide Corn Gluten Meal

Note, labels can change on a regular basis. Therefore, always read the labels before purchasing and before using any of these herbicides to determine which grasses they can safely be used on and what weeds they will control.

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Table VI. Partial List of Common and Trade Names for Postemergent Weed Control in Home Lawns by Homeowners:

Common Name Trade Names (partial list)

1. 2,4-D 2,4-D Amine No. 4; American 2,4-D Selective Weed

Killer

2. 2,4-D, MCPP, Ace Spot Weed Killer; Bayer Advanced Lawns Southern

Dicamba Weed; Ferti-lome Weed Out Lawn Weed Killer; Green Light Wipe Out Broadleaf Weed Killer; Ortho Weed-B-

Gon; Spectracide Weed Stop For Lawns; Southern Ag.

Lawn Weed Killer: Hi-Yield Lawn Weed Killer; Bonide Weed Beater Lawn Weed Killer; Bonide Weed Beater Southern Lawns

3. imazaquin Ambrands Image

4. msma, dsma, cma Green Light MSMA Crabgrass Killer; Ambrands Image

“Kills Crabgrass”; Ortho Weed- B-Gon Crabgrass Killer

for Lawns; Bonide MSMA Crabgrass Killer;

Ferti-lome Crabgrass, Nutsedge and Dallisgrass Killer;

Hi-Yield 529 MSMA Weed Killer

5. 2,4-D, mcpp, dicamba Bayer Advanced Lawns All-in-One Weed Killer; Fertilome Weed Out Plus Lawn Weed and Grass Killer; Bonide Weed Beater Plus

6. triclopyr Ortho Weed-B-Gon Chickweed, Clover and Oxalis Killer; Hi-Yield Turflon Ester

7. bentazon Southern Ag Sedge Hammer; Monterey Nihalator;

Hi-Yield Basagran

8. mcpp, 2,4-D, dicamba Southern Ag Lawn Weed Killer; Ortho Weed-B-Gon

Weed Killer for Lawns; Ortho Weed-B-Gon Kills

Weeds, Not Lawns

9. 2,4-D, mcpp, dicamba, Ferti-lome Weed Free Zone

carfentrazone

10. 2,4-D, MCPP_p, Basic Solutions Lawn Weed Killer

dichloprop_p

11. 2, 4-D, triclopyr, dicamba Bonide Chickweed, Clover and Oxalis Killer; Ortho Weed-B-Gon Max

12. 2,4-D, MCPP, dicamba Spectracide Weed Stop 2X for Lawns

+ sulfentrazone

Note, labels are always changing. Always advise individuals to read the label before purchasing and before applying to make sure the herbicide is still labeled for use in their type of lawn grass and for the weeds they are trying to control.

Following is a list of several websites that are excellent for looking up common weeds found in turfgrasses.

www.weedalert.com

www.griffin.uga.edu/grf/dept/cropsci/turf/weedcontrol/homepage.shtml

www.psu.missouri.edu/fishel/Default.htm

http://ipm.ucdavis.edu/PMG/weeds_common.html

http://jimmcafee.tamu.edu